Evaporator



April 22, 1924. 1,491,544

D. B. MORISON EVAPORATOR Filed March 28. 1923 3 sheets-sheet 1 April 22, 1924.

D. B. MORISON EVAPORATOR Filed March 28. 1923 3 Sheets-Sheet 2 /n ven for-.-

Oor/ald Barns Marisa ,5% d @A IMMIJW l-.tented Apr. 22, 1F24.V

DONALD Banus Morrison", or nanfrrnnoon, ,nNciLAyNnj Everoaaron.

Application led March 28, 1923. Serial Ilo. 628,339.

To all e/fzom'z't may concem: A 1 y Be it known .that l, DONALD BARNs Mohr son, or Hartlepool, in the county of Durham, England. have invented certain new and userd improvements in Evaporators. ot whichV y the Vfollowing is a specilica-tion.

This invention relates to apparatus for l to promoting upward circulation 'faro throughout the hea-ting coil chamber, dry ir -j the generated steam and facilitating the construction-attachment and removal of the steam drying and steam generating devices.

l have Vfound that the eiliciency ot' the steam generating surfaces is increasedl when the circulation throughout the cross section ot the heating zone-comprising the heating foil chamber--is uniform and upward and that given upward and uniform circulation the turbulence on the surface area of the boiling water is evenly distributed, thereby promoting greater generation vof steam without excessive wetness. According to my invention the drainage water from the sepa rating devices, the i'eed water supply, to gather with water from the steam bubble zone, pass downwardly through one or more passages and together form the downwardly circulating supply which is distributed below the heatingsuraces and which passes uniformly upwardly throughout the heating zone. That is to. say the water is in continuous circulation upwardly throughout the heating zone, and from the bubble sone downwardly through the independent passage or passages 'for admission and distribution below the heating zone.

Above the heating` surface` a. perforated plate is xed and provided with a gutterway or channel through which the separated water is led to a passage terminating below the heating suface. Towards the top of the evaporator the steam is caused to,

rlow upwardly against a diaphragm by which it is deflected downwardly into a water separating chamber provided with pipes or other devices through which the sepa-rated water passes to a depositing plate and is led as before to below the heating evaporating liquids such for example, as are surface. The heatingv surface/sare usually horizontally disposed tubular vcoils in pairsandare, according to this inventiomatta-ched to a ported iange common to the inlet and outlet ends of the'coil which is held in position by one or more bolts operated :trom outside the evaporator', the steamV supply and exhaustv chambers being em!Y bodied ina casing preferably removable.

In the accompanying drawings. I have illustiated an evaporator` constructed in aocordance with the invention. In these draw-A ings Fig. l is an elevational view, Fig. 2 a vertical section on the Vline 2-2 of Fig.- 1, Fig. 3 a transverse section onV the line` 3-3 of Fig. 2, Fig.r 4 is a plan view partly insection illustrating a coil .and its means or" attachment which in the example shown is removable, Fig. V5 is'an elevational view thereof Vpartly in section on the line 5,.-'5V of Fig. 6, Fig. 6 is,V a view looking inthe direction of the arrow A and Fig. 7- is a similar vview loolring'in the direction of the arrow B. Fig. 8 is a vertical sectional View of onefform ofliquid collecting device, Fig.A 9 is a transverse section thereof on line 9--9V Y of Fig. 8, Figs.. 10 and 11 are similar views l designates the evaporator shell within the 1 lower part or' which the steam coils Zara located, the shell being provided with an opening 3 closed by a door 4, through which the coils can be withdrawn for inspection and cleaning as will hereafter appear. The coils are arranged horizontally andv Vsuperimposed one upon the other and the ends' of each coil are brought together and brazed or otherwise secured to a itment 5 whichv malres junction With a removable steam and exhaust receiver or chest 6, a single bolt 7 adapted to pass through this removable chest serving in conjunction with the nut 8 to hold the coil securely in position. Thus Y each complete coil is held in position by one bolt which is accessible from outside the evaporator shell and it will be seen that by slacking back the nut 8 and unscrewing the bolt 7 each coil as a whole can be removed through the opening 3. By reason of the removability of the steam and exhaust re ceiver or chest G the `coils can be connected up 'to thisV chest and tested prior to their final assembly within the evaporator shell.

lll)

- The door 4f closing the opening 3 is provided Yrated liquid deposited on the upper surface thereof can pass from this plate downwardly into the inlet chamber 9 where it mixes with the incoming liquid and passes downwardly back to the base of the evaporator below the coils. rlhe upward passa e o vapour through the perforations is su cient to prevent the greater portion ot theV separated liquid falling on the plate from passing through the periorations, so that it runs od and is discharged o-ver its edge down the passage 9. Near the top ot the steamY dome of the evaporator l provide a water separating device or steam drier and this separating device is preferably bodily removable through an opening 14 closed by a door or panel l5.

This separating device comprises a central pipe 16 upstanding Jtroni a collecting tray or channel 18 and passes through a perforated plate 17 which may cover the. collecting tray. Over the top ci this central pipe a. baille 19 is arranged and collecting rings or channels :20 depend tromvthis bat'- le, these collecting rings draining by means of pipes- 21 passing through the current oi steam 'i'rom which the liquid has been separated into the collecting tray 18 so that any condensed vapour is trapped and finally drains otf the tray 18 through an opening 22 in its liange into a vertical channel 23 in the wall of the evaporator shell and thence passes back to the base of the evaporator beneath the coils. vt will be understood that the number of the collecting rings 20 depending trom the baille 19 may vary as desired, ln Figs. 1, 8 and 9 only one is shown whereas in Figs. 10 and 11 two are shown and it will be readily understood that a series may be provided it necessary or desirable. A vapour outlet 2l is provided and steam is admitted to the coils in the usual way through an out-let 25. lt will be seen that by reason of the Jforegoing construction and arrangement the liquid separated ;troni the generated vapour together with liquid from the ebullition Zone are led bach and distributed beneath the heating coils so that uniform upward circulation through the heating zone is promoted. All the liquid separated from the vapour passes to below the heating coils 2 by the passages 23 and 9 so that such returned liquid will not interfere in any way with the upward circulation in the evaporator.

What I claim and desire to secure by Letters Patent is 1. An evaporator in which liquid is sepof the evaporator, the discharge passage from the upper separator being termed integral with the walls of the evaporator and exterior to the heating coil chamber while the discharge passage from the lower separaterV is formed on the inner side of the removable door.

2. in evaporator in which liquid is separated from the vapour, comprising heating coils, a receiver, a removable door in the walls of the evaporator, a separator secured in the upper portion of the vapour space near the outlet thereof, a liquid discharge passage in walls ot the evaporator and integral therewith opening at one end into the upper portion et the evaporator and at the other into the space below the coils, a second separator arranged immediately aloovcthe coils, a second liquid discharge passage on the inner side of the door, and open at its lower end into the space below the coils` the coils being supported by and leading into the receiver, the irst liquid discharge passage receiving at its upper end liquid from the separator, while the second liquid discharge passage receives at its upper end liquid troni the lower separator.

3. An evaporator in which liquid is sepa rated from the vapor comprising heating coils, removable door through which the heating coils may be removed, two separators each having a downwardly extending liquid discharge passage, one of the separators being secured in the upper portion of the vapor space of the evaporator, and having its liquid discharge passage integral with the walls of the evaporator and eX- terior to said heating coil chamber and discharging liquid below the ebullition zone of the evaporator, the other separator being secured in the ebullition Zone in the lower portion of the vapor space of the evaporator, its discharge passage being formed on the inner side of the removable door and discharging its liquid below the coils.

ln testimony whereof, l aiiiX. my signature.

DONALD BARNS MORISON. 

